Cents are almost universally used today as a small logarithmic measurement to compare interval sizes, however, certain authors prefer not to use the usual 12edo scale as a basis for comparison, and thus prefer millioctaves.

The most prominent use of millioctaves is perhaps in Mark Lindley / Ronald Turner-Smith, Mathematical Models of Musical Scales (1993).

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millioctaves calculator

Ratio may be entered as fraction or floating-point decimal number.
(value must be greater than 1)

For EDOs (equal-temperaments), type: "a/b" (without quotes)
where "a" = EDO degree and "b" = EDO cardinality.
(value must be less than 1)

Enter ratio: = millioctaves

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